From: David Tran <email55555@...>
Date: 2005-08-09T21:51:17+09:00
Subject: Re: Ruby/Tk core library desing question (TkCanvas#create)

> No. That is the identifier of the canvas item.
> TkCanvas#create method is used when you don't want to create 
> a ruby object for a canvas item (for example, you worry about
> memory costs for many items).
> And then, to configure the item, you have to use the identifier 
> (if you don't give canvas tags to the item).
> You shouldn't assume that the return value is a number.
> -- 
> Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)

I missunderstood the return value.

require 'tk'
c = TkCanvas.new.pack
r = c.create(TkcRectangle, 10, 10, 50, 50)
puts "r = #{r}; type = #{r.class}" 
c.itemconfigure(r, :fill=>:red)
Tk.mainloop

Got it now, even the r is Fixnum class, it is item identifier.
So, later we can use it on itemconfigure to modify the item.

Thank you.